The 24-year-old Cameroon midfielder underwent his medical tests with the club this morning and is now set to put pen-to-paper on a five-year contract with the Spanish giants later this afternoon.

Doctor Ricard Pruna said of Song: "He has a very low body fat percentage and very good muscle quality. All the tests have come out satisfactorily and he is available to the coach."

Song, whose contract with Barça will have a buy-out clause of 80million euros, is then set to join his new team-mates for the official team presentation at the Joan Gamper Trophy at the Nou Camp this evening, where the Catalan club face Sampdoria.

Song sat out Arsenal's Premier League opener against Sunderland on Saturday amid widespread speculation he was on the verge of a move to Barça, and immediately after that match it was announced that the two clubs had agreed terms for the transfer of the player.

The midfielder joined Arsenal on loan from French club Bastia in August 2005 before Arsene Wenger made the move permanent at the end of the 2005/06 season.